@Rukbat, does not compute.
You are talking about apps that are enabled and were ran in the recent past. And you are right.
I am talking about an app that is turned off since a long time ago, the phone has been rebooted several times since then, yet it is using almost half a gigabyte of RAM.
For example, tonight it is using 268 MB.
I am saying "using" because the phone says "AVERAGE MEMORY
USAGE" if you press Memory for details.
The phone is stock, without any modifications whatsoever. No picture on AOD.